Hmmm ... this thread looks a little 'mature'...
I cannot help but ask, however, why not just use
a site like del.icio.us for this kind of functionality?

I am a big fan of tagging and 'folksonomy' and it seems
like a lot of the effort required for 'infrasturcture' is
already in place, and the real difficult part is
the actual cognitive effort required to link 'human operational terms' into 'perl equivalent terms'.

The benefit of del.icio.us is also that folksonomies get
associated with a specific *user*, which means tag pollution and tag bigotry would have an automatic 'credibility filter'. If you happen to like a given perlmonks user, and someone has maliciously tagged that user's content as *junk*, you can ignore the person who did the malicious tagging and assume they are a low-credibility source.

UPDATE:This was added late because I thought these points merited consideration, not to downplay the work already done here on perlmonks. Overall I think the functionality sounds great, and I hope it takes off.